git.sesse.net Git - ffmpeg/blob - ffmpeg_filter.c

   1 /*
   2  * ffmpeg filter configuration
   3  *
   4  * This file is part of FFmpeg.
   5  *
   6  * FFmpeg is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * FFmpeg is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with FFmpeg; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  19  */
  20
  21 #include <stdint.h>
  22
  23 #include "ffmpeg.h"
  24
  25 #include "libavfilter/avfilter.h"
  26 #include "libavfilter/buffersink.h"
  27 #include "libavfilter/buffersrc.h"
  28
  29 #include "libavresample/avresample.h"
  30
  31 #include "libavutil/avassert.h"
  32 #include "libavutil/avstring.h"
  33 #include "libavutil/bprint.h"
  34 #include "libavutil/channel_layout.h"
  35 #include "libavutil/display.h"
  36 #include "libavutil/opt.h"
  37 #include "libavutil/pixdesc.h"
  38 #include "libavutil/pixfmt.h"
  39 #include "libavutil/imgutils.h"
  40 #include "libavutil/samplefmt.h"
  41
  42 static const enum AVPixelFormat *get_compliance_unofficial_pix_fmts(enum AVCodecID codec_id, const enum AVPixelFormat default_formats[])
  43 {
  44     static const enum AVPixelFormat mjpeg_formats[] =
  45         { AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUVJ444P,
  46           AV_PIX_FMT_YUV420P,  AV_PIX_FMT_YUV422P,  AV_PIX_FMT_YUV444P,
  47           AV_PIX_FMT_NONE };
  48     static const enum AVPixelFormat ljpeg_formats[] =
  49         { AV_PIX_FMT_BGR24   , AV_PIX_FMT_BGRA    , AV_PIX_FMT_BGR0,
  50           AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVJ422P,
  51           AV_PIX_FMT_YUV420P , AV_PIX_FMT_YUV444P , AV_PIX_FMT_YUV422P,
  52           AV_PIX_FMT_NONE};
  53
  54     if (codec_id == AV_CODEC_ID_MJPEG) {
  55         return mjpeg_formats;
  56     } else if (codec_id == AV_CODEC_ID_LJPEG) {
  57         return ljpeg_formats;
  58     } else {
  59         return default_formats;
  60     }
  61 }
  62
  63 enum AVPixelFormat choose_pixel_fmt(AVStream *st, AVCodecContext *enc_ctx, AVCodec *codec, enum AVPixelFormat target)
  64 {
  65     if (codec && codec->pix_fmts) {
  66         const enum AVPixelFormat *p = codec->pix_fmts;
  67         const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(target);
  68         int has_alpha = desc ? desc->nb_components % 2 == 0 : 0;
  69         enum AVPixelFormat best= AV_PIX_FMT_NONE;
  70
  71         if (enc_ctx->strict_std_compliance <= FF_COMPLIANCE_UNOFFICIAL) {
  72             p = get_compliance_unofficial_pix_fmts(enc_ctx->codec_id, p);
  73         }
  74         for (; *p != AV_PIX_FMT_NONE; p++) {
  75             best= avcodec_find_best_pix_fmt_of_2(best, *p, target, has_alpha, NULL);
  76             if (*p == target)
  77                 break;
  78         }
  79         if (*p == AV_PIX_FMT_NONE) {
  80             if (target != AV_PIX_FMT_NONE)
  81                 av_log(NULL, AV_LOG_WARNING,
  82                        "Incompatible pixel format '%s' for codec '%s', auto-selecting format '%s'\n",
  83                        av_get_pix_fmt_name(target),
  84                        codec->name,
  85                        av_get_pix_fmt_name(best));
  86             return best;
  87         }
  88     }
  89     return target;
  90 }
  91
  92 void choose_sample_fmt(AVStream *st, AVCodec *codec)
  93 {
  94     if (codec && codec->sample_fmts) {
  95         const enum AVSampleFormat *p = codec->sample_fmts;
  96         for (; *p != -1; p++) {
  97             if (*p == st->codec->sample_fmt)
  98                 break;
  99         }
 100         if (*p == -1) {
 101             if((codec->capabilities & AV_CODEC_CAP_LOSSLESS) && av_get_sample_fmt_name(st->codec->sample_fmt) > av_get_sample_fmt_name(codec->sample_fmts[0]))
 102                 av_log(NULL, AV_LOG_ERROR, "Conversion will not be lossless.\n");
 103             if(av_get_sample_fmt_name(st->codec->sample_fmt))
 104             av_log(NULL, AV_LOG_WARNING,
 105                    "Incompatible sample format '%s' for codec '%s', auto-selecting format '%s'\n",
 106                    av_get_sample_fmt_name(st->codec->sample_fmt),
 107                    codec->name,
 108                    av_get_sample_fmt_name(codec->sample_fmts[0]));
 109             st->codec->sample_fmt = codec->sample_fmts[0];
 110         }
 111     }
 112 }
 113
 114 static char *choose_pix_fmts(OutputStream *ost)
 115 {
 116     AVDictionaryEntry *strict_dict = av_dict_get(ost->encoder_opts, "strict", NULL, 0);
 117     if (strict_dict)
 118         // used by choose_pixel_fmt() and below
 119         av_opt_set(ost->enc_ctx, "strict", strict_dict->value, 0);
 120
 121      if (ost->keep_pix_fmt) {
 122         if (ost->filter)
 123             avfilter_graph_set_auto_convert(ost->filter->graph->graph,
 124                                             AVFILTER_AUTO_CONVERT_NONE);
 125         if (ost->enc_ctx->pix_fmt == AV_PIX_FMT_NONE)
 126             return NULL;
 127         return av_strdup(av_get_pix_fmt_name(ost->enc_ctx->pix_fmt));
 128     }
 129     if (ost->enc_ctx->pix_fmt != AV_PIX_FMT_NONE) {
 130         return av_strdup(av_get_pix_fmt_name(choose_pixel_fmt(ost->st, ost->enc_ctx, ost->enc, ost->enc_ctx->pix_fmt)));
 131     } else if (ost->enc && ost->enc->pix_fmts) {
 132         const enum AVPixelFormat *p;
 133         AVIOContext *s = NULL;
 134         uint8_t *ret;
 135         int len;
 136
 137         if (avio_open_dyn_buf(&s) < 0)
 138             exit_program(1);
 139
 140         p = ost->enc->pix_fmts;
 141         if (ost->enc_ctx->strict_std_compliance <= FF_COMPLIANCE_UNOFFICIAL) {
 142             p = get_compliance_unofficial_pix_fmts(ost->enc_ctx->codec_id, p);
 143         }
 144
 145         for (; *p != AV_PIX_FMT_NONE; p++) {
 146             const char *name = av_get_pix_fmt_name(*p);
 147             avio_printf(s, "%s|", name);
 148         }
 149         len = avio_close_dyn_buf(s, &ret);
 150         ret[len - 1] = 0;
 151         return ret;
 152     } else
 153         return NULL;
 154 }
 155
 156 /* Define a function for building a string containing a list of
 157  * allowed formats. */
 158 #define DEF_CHOOSE_FORMAT(type, var, supported_list, none, get_name)           \
 159 static char *choose_ ## var ## s(OutputStream *ost)                            \
 160 {                                                                              \
 161     if (ost->enc_ctx->var != none) {                                           \
 162         get_name(ost->enc_ctx->var);                                           \
 163         return av_strdup(name);                                                \
 164     } else if (ost->enc && ost->enc->supported_list) {                         \
 165         const type *p;                                                         \
 166         AVIOContext *s = NULL;                                                 \
 167         uint8_t *ret;                                                          \
 168         int len;                                                               \
 169                                                                                \
 170         if (avio_open_dyn_buf(&s) < 0)                                         \
 171             exit_program(1);                                                           \
 172                                                                                \
 173         for (p = ost->enc->supported_list; *p != none; p++) {                  \
 174             get_name(*p);                                                      \
 175             avio_printf(s, "%s|", name);                                       \
 176         }                                                                      \
 177         len = avio_close_dyn_buf(s, &ret);                                     \
 178         ret[len - 1] = 0;                                                      \
 179         return ret;                                                            \
 180     } else                                                                     \
 181         return NULL;                                                           \
 182 }
 183
 184 // DEF_CHOOSE_FORMAT(enum AVPixelFormat, pix_fmt, pix_fmts, AV_PIX_FMT_NONE,
 185 //                   GET_PIX_FMT_NAME)
 186
 187 DEF_CHOOSE_FORMAT(enum AVSampleFormat, sample_fmt, sample_fmts,
 188                   AV_SAMPLE_FMT_NONE, GET_SAMPLE_FMT_NAME)
 189
 190 DEF_CHOOSE_FORMAT(int, sample_rate, supported_samplerates, 0,
 191                   GET_SAMPLE_RATE_NAME)
 192
 193 DEF_CHOOSE_FORMAT(uint64_t, channel_layout, channel_layouts, 0,
 194                   GET_CH_LAYOUT_NAME)
 195
 196 int init_simple_filtergraph(InputStream *ist, OutputStream *ost)
 197 {
 198     FilterGraph *fg = av_mallocz(sizeof(*fg));
 199
 200     if (!fg)
 201         exit_program(1);
 202     fg->index = nb_filtergraphs;
 203
 204     GROW_ARRAY(fg->outputs, fg->nb_outputs);
 205     if (!(fg->outputs[0] = av_mallocz(sizeof(*fg->outputs[0]))))
 206         exit_program(1);
 207     fg->outputs[0]->ost   = ost;
 208     fg->outputs[0]->graph = fg;
 209
 210     ost->filter = fg->outputs[0];
 211
 212     GROW_ARRAY(fg->inputs, fg->nb_inputs);
 213     if (!(fg->inputs[0] = av_mallocz(sizeof(*fg->inputs[0]))))
 214         exit_program(1);
 215     fg->inputs[0]->ist   = ist;
 216     fg->inputs[0]->graph = fg;
 217
 218     GROW_ARRAY(ist->filters, ist->nb_filters);
 219     ist->filters[ist->nb_filters - 1] = fg->inputs[0];
 220
 221     GROW_ARRAY(filtergraphs, nb_filtergraphs);
 222     filtergraphs[nb_filtergraphs - 1] = fg;
 223
 224     return 0;
 225 }
 226
 227 static void init_input_filter(FilterGraph *fg, AVFilterInOut *in)
 228 {
 229     InputStream *ist = NULL;
 230     enum AVMediaType type = avfilter_pad_get_type(in->filter_ctx->input_pads, in->pad_idx);
 231     int i;
 232
 233     // TODO: support other filter types
 234     if (type != AVMEDIA_TYPE_VIDEO && type != AVMEDIA_TYPE_AUDIO) {
 235         av_log(NULL, AV_LOG_FATAL, "Only video and audio filters supported "
 236                "currently.\n");
 237         exit_program(1);
 238     }
 239
 240     if (in->name) {
 241         AVFormatContext *s;
 242         AVStream       *st = NULL;
 243         char *p;
 244         int file_idx = strtol(in->name, &p, 0);
 245
 246         if (file_idx < 0 || file_idx >= nb_input_files) {
 247             av_log(NULL, AV_LOG_FATAL, "Invalid file index %d in filtergraph description %s.\n",
 248                    file_idx, fg->graph_desc);
 249             exit_program(1);
 250         }
 251         s = input_files[file_idx]->ctx;
 252
 253         for (i = 0; i < s->nb_streams; i++) {
 254             enum AVMediaType stream_type = s->streams[i]->codec->codec_type;
 255             if (stream_type != type &&
 256                 !(stream_type == AVMEDIA_TYPE_SUBTITLE &&
 257                   type == AVMEDIA_TYPE_VIDEO /* sub2video hack */))
 258                 continue;
 259             if (check_stream_specifier(s, s->streams[i], *p == ':' ? p + 1 : p) == 1) {
 260                 st = s->streams[i];
 261                 break;
 262             }
 263         }
 264         if (!st) {
 265             av_log(NULL, AV_LOG_FATAL, "Stream specifier '%s' in filtergraph description %s "
 266                    "matches no streams.\n", p, fg->graph_desc);
 267             exit_program(1);
 268         }
 269         ist = input_streams[input_files[file_idx]->ist_index + st->index];
 270     } else {
 271         /* find the first unused stream of corresponding type */
 272         for (i = 0; i < nb_input_streams; i++) {
 273             ist = input_streams[i];
 274             if (ist->dec_ctx->codec_type == type && ist->discard)
 275                 break;
 276         }
 277         if (i == nb_input_streams) {
 278             av_log(NULL, AV_LOG_FATAL, "Cannot find a matching stream for "
 279                    "unlabeled input pad %d on filter %s\n", in->pad_idx,
 280                    in->filter_ctx->name);
 281             exit_program(1);
 282         }
 283     }
 284     av_assert0(ist);
 285
 286     ist->discard         = 0;
 287     ist->decoding_needed |= DECODING_FOR_FILTER;
 288     ist->st->discard = AVDISCARD_NONE;
 289
 290     GROW_ARRAY(fg->inputs, fg->nb_inputs);
 291     if (!(fg->inputs[fg->nb_inputs - 1] = av_mallocz(sizeof(*fg->inputs[0]))))
 292         exit_program(1);
 293     fg->inputs[fg->nb_inputs - 1]->ist   = ist;
 294     fg->inputs[fg->nb_inputs - 1]->graph = fg;
 295
 296     GROW_ARRAY(ist->filters, ist->nb_filters);
 297     ist->filters[ist->nb_filters - 1] = fg->inputs[fg->nb_inputs - 1];
 298 }
 299
 300 int init_complex_filtergraph(FilterGraph *fg)
 301 {
 302     AVFilterInOut *inputs, *outputs, *cur;
 303     AVFilterGraph *graph;
 304     int ret = 0;
 305
 306     /* this graph is only used for determining the kinds of inputs
 307      * and outputs we have, and is discarded on exit from this function */
 308     graph = avfilter_graph_alloc();
 309     if (!graph)
 310         return AVERROR(ENOMEM);
 311
 312     ret = avfilter_graph_parse2(graph, fg->graph_desc, &inputs, &outputs);
 313     if (ret < 0)
 314         goto fail;
 315
 316     for (cur = inputs; cur; cur = cur->next)
 317         init_input_filter(fg, cur);
 318
 319     for (cur = outputs; cur;) {
 320         GROW_ARRAY(fg->outputs, fg->nb_outputs);
 321         fg->outputs[fg->nb_outputs - 1] = av_mallocz(sizeof(*fg->outputs[0]));
 322         if (!fg->outputs[fg->nb_outputs - 1])
 323             exit_program(1);
 324
 325         fg->outputs[fg->nb_outputs - 1]->graph   = fg;
 326         fg->outputs[fg->nb_outputs - 1]->out_tmp = cur;
 327         fg->outputs[fg->nb_outputs - 1]->type    = avfilter_pad_get_type(cur->filter_ctx->output_pads,
 328                                                                          cur->pad_idx);
 329         cur = cur->next;
 330         fg->outputs[fg->nb_outputs - 1]->out_tmp->next = NULL;
 331     }
 332
 333 fail:
 334     avfilter_inout_free(&inputs);
 335     avfilter_graph_free(&graph);
 336     return ret;
 337 }
 338
 339 static int insert_trim(int64_t start_time, int64_t duration,
 340                        AVFilterContext **last_filter, int *pad_idx,
 341                        const char *filter_name)
 342 {
 343     AVFilterGraph *graph = (*last_filter)->graph;
 344     AVFilterContext *ctx;
 345     const AVFilter *trim;
 346     enum AVMediaType type = avfilter_pad_get_type((*last_filter)->output_pads, *pad_idx);
 347     const char *name = (type == AVMEDIA_TYPE_VIDEO) ? "trim" : "atrim";
 348     int ret = 0;
 349
 350     if (duration == INT64_MAX && start_time == AV_NOPTS_VALUE)
 351         return 0;
 352
 353     trim = avfilter_get_by_name(name);
 354     if (!trim) {
 355         av_log(NULL, AV_LOG_ERROR, "%s filter not present, cannot limit "
 356                "recording time.\n", name);
 357         return AVERROR_FILTER_NOT_FOUND;
 358     }
 359
 360     ctx = avfilter_graph_alloc_filter(graph, trim, filter_name);
 361     if (!ctx)
 362         return AVERROR(ENOMEM);
 363
 364     if (duration != INT64_MAX) {
 365         ret = av_opt_set_int(ctx, "durationi", duration,
 366                                 AV_OPT_SEARCH_CHILDREN);
 367     }
 368     if (ret >= 0 && start_time != AV_NOPTS_VALUE) {
 369         ret = av_opt_set_int(ctx, "starti", start_time,
 370                                 AV_OPT_SEARCH_CHILDREN);
 371     }
 372     if (ret < 0) {
 373         av_log(ctx, AV_LOG_ERROR, "Error configuring the %s filter", name);
 374         return ret;
 375     }
 376
 377     ret = avfilter_init_str(ctx, NULL);
 378     if (ret < 0)
 379         return ret;
 380
 381     ret = avfilter_link(*last_filter, *pad_idx, ctx, 0);
 382     if (ret < 0)
 383         return ret;
 384
 385     *last_filter = ctx;
 386     *pad_idx     = 0;
 387     return 0;
 388 }
 389
 390 static int insert_filter(AVFilterContext **last_filter, int *pad_idx,
 391                          const char *filter_name, const char *args)
 392 {
 393     AVFilterGraph *graph = (*last_filter)->graph;
 394     AVFilterContext *ctx;
 395     int ret;
 396
 397     ret = avfilter_graph_create_filter(&ctx,
 398                                        avfilter_get_by_name(filter_name),
 399                                        filter_name, args, NULL, graph);
 400     if (ret < 0)
 401         return ret;
 402
 403     ret = avfilter_link(*last_filter, *pad_idx, ctx, 0);
 404     if (ret < 0)
 405         return ret;
 406
 407     *last_filter = ctx;
 408     *pad_idx     = 0;
 409     return 0;
 410 }
 411
 412 static int configure_output_video_filter(FilterGraph *fg, OutputFilter *ofilter, AVFilterInOut *out)
 413 {
 414     char *pix_fmts;
 415     OutputStream *ost = ofilter->ost;
 416     OutputFile    *of = output_files[ost->file_index];
 417     AVCodecContext *codec = ost->enc_ctx;
 418     AVFilterContext *last_filter = out->filter_ctx;
 419     int pad_idx = out->pad_idx;
 420     int ret;
 421     char name[255];
 422
 423     snprintf(name, sizeof(name), "output stream %d:%d", ost->file_index, ost->index);
 424     ret = avfilter_graph_create_filter(&ofilter->filter,
 425                                        avfilter_get_by_name("buffersink"),
 426                                        name, NULL, NULL, fg->graph);
 427
 428     if (ret < 0)
 429         return ret;
 430
 431     if (!hw_device_ctx && (codec->width || codec->height)) {
 432         char args[255];
 433         AVFilterContext *filter;
 434         AVDictionaryEntry *e = NULL;
 435
 436         snprintf(args, sizeof(args), "%d:%d",
 437                  codec->width,
 438                  codec->height);
 439
 440         while ((e = av_dict_get(ost->sws_dict, "", e,
 441                                 AV_DICT_IGNORE_SUFFIX))) {
 442             av_strlcatf(args, sizeof(args), ":%s=%s", e->key, e->value);
 443         }
 444
 445         snprintf(name, sizeof(name), "scaler for output stream %d:%d",
 446                  ost->file_index, ost->index);
 447         if ((ret = avfilter_graph_create_filter(&filter, avfilter_get_by_name("scale"),
 448                                                 name, args, NULL, fg->graph)) < 0)
 449             return ret;
 450         if ((ret = avfilter_link(last_filter, pad_idx, filter, 0)) < 0)
 451             return ret;
 452
 453         last_filter = filter;
 454         pad_idx = 0;
 455     }
 456
 457     if ((pix_fmts = choose_pix_fmts(ost))) {
 458         AVFilterContext *filter;
 459         snprintf(name, sizeof(name), "pixel format for output stream %d:%d",
 460                  ost->file_index, ost->index);
 461         ret = avfilter_graph_create_filter(&filter,
 462                                            avfilter_get_by_name("format"),
 463                                            "format", pix_fmts, NULL, fg->graph);
 464         av_freep(&pix_fmts);
 465         if (ret < 0)
 466             return ret;
 467         if ((ret = avfilter_link(last_filter, pad_idx, filter, 0)) < 0)
 468             return ret;
 469
 470         last_filter = filter;
 471         pad_idx     = 0;
 472     }
 473
 474     if (ost->frame_rate.num && 0) {
 475         AVFilterContext *fps;
 476         char args[255];
 477
 478         snprintf(args, sizeof(args), "fps=%d/%d", ost->frame_rate.num,
 479                  ost->frame_rate.den);
 480         snprintf(name, sizeof(name), "fps for output stream %d:%d",
 481                  ost->file_index, ost->index);
 482         ret = avfilter_graph_create_filter(&fps, avfilter_get_by_name("fps"),
 483                                            name, args, NULL, fg->graph);
 484         if (ret < 0)
 485             return ret;
 486
 487         ret = avfilter_link(last_filter, pad_idx, fps, 0);
 488         if (ret < 0)
 489             return ret;
 490         last_filter = fps;
 491         pad_idx = 0;
 492     }
 493
 494     snprintf(name, sizeof(name), "trim for output stream %d:%d",
 495              ost->file_index, ost->index);
 496     ret = insert_trim(of->start_time, of->recording_time,
 497                       &last_filter, &pad_idx, name);
 498     if (ret < 0)
 499         return ret;
 500
 501
 502     if ((ret = avfilter_link(last_filter, pad_idx, ofilter->filter, 0)) < 0)
 503         return ret;
 504
 505     return 0;
 506 }
 507
 508 static int configure_output_audio_filter(FilterGraph *fg, OutputFilter *ofilter, AVFilterInOut *out)
 509 {
 510     OutputStream *ost = ofilter->ost;
 511     OutputFile    *of = output_files[ost->file_index];
 512     AVCodecContext *codec  = ost->enc_ctx;
 513     AVFilterContext *last_filter = out->filter_ctx;
 514     int pad_idx = out->pad_idx;
 515     char *sample_fmts, *sample_rates, *channel_layouts;
 516     char name[255];
 517     int ret;
 518
 519     snprintf(name, sizeof(name), "output stream %d:%d", ost->file_index, ost->index);
 520     ret = avfilter_graph_create_filter(&ofilter->filter,
 521                                        avfilter_get_by_name("abuffersink"),
 522                                        name, NULL, NULL, fg->graph);
 523     if (ret < 0)
 524         return ret;
 525     if ((ret = av_opt_set_int(ofilter->filter, "all_channel_counts", 1, AV_OPT_SEARCH_CHILDREN)) < 0)
 526         return ret;
 527
 528 #define AUTO_INSERT_FILTER(opt_name, filter_name, arg) do {                 \
 529     AVFilterContext *filt_ctx;                                              \
 530                                                                             \
 531     av_log(NULL, AV_LOG_INFO, opt_name " is forwarded to lavfi "            \
 532            "similarly to -af " filter_name "=%s.\n", arg);                  \
 533                                                                             \
 534     ret = avfilter_graph_create_filter(&filt_ctx,                           \
 535                                        avfilter_get_by_name(filter_name),   \
 536                                        filter_name, arg, NULL, fg->graph);  \
 537     if (ret < 0)                                                            \
 538         return ret;                                                         \
 539                                                                             \
 540     ret = avfilter_link(last_filter, pad_idx, filt_ctx, 0);                 \
 541     if (ret < 0)                                                            \
 542         return ret;                                                         \
 543                                                                             \
 544     last_filter = filt_ctx;                                                 \
 545     pad_idx = 0;                                                            \
 546 } while (0)
 547     if (ost->audio_channels_mapped) {
 548         int i;
 549         AVBPrint pan_buf;
 550         av_bprint_init(&pan_buf, 256, 8192);
 551         av_bprintf(&pan_buf, "0x%"PRIx64,
 552                    av_get_default_channel_layout(ost->audio_channels_mapped));
 553         for (i = 0; i < ost->audio_channels_mapped; i++)
 554             if (ost->audio_channels_map[i] != -1)
 555                 av_bprintf(&pan_buf, "|c%d=c%d", i, ost->audio_channels_map[i]);
 556
 557         AUTO_INSERT_FILTER("-map_channel", "pan", pan_buf.str);
 558         av_bprint_finalize(&pan_buf, NULL);
 559     }
 560
 561     if (codec->channels && !codec->channel_layout)
 562         codec->channel_layout = av_get_default_channel_layout(codec->channels);
 563
 564     sample_fmts     = choose_sample_fmts(ost);
 565     sample_rates    = choose_sample_rates(ost);
 566     channel_layouts = choose_channel_layouts(ost);
 567     if (sample_fmts || sample_rates || channel_layouts) {
 568         AVFilterContext *format;
 569         char args[256];
 570         args[0] = 0;
 571
 572         if (sample_fmts)
 573             av_strlcatf(args, sizeof(args), "sample_fmts=%s:",
 574                             sample_fmts);
 575         if (sample_rates)
 576             av_strlcatf(args, sizeof(args), "sample_rates=%s:",
 577                             sample_rates);
 578         if (channel_layouts)
 579             av_strlcatf(args, sizeof(args), "channel_layouts=%s:",
 580                             channel_layouts);
 581
 582         av_freep(&sample_fmts);
 583         av_freep(&sample_rates);
 584         av_freep(&channel_layouts);
 585
 586         snprintf(name, sizeof(name), "audio format for output stream %d:%d",
 587                  ost->file_index, ost->index);
 588         ret = avfilter_graph_create_filter(&format,
 589                                            avfilter_get_by_name("aformat"),
 590                                            name, args, NULL, fg->graph);
 591         if (ret < 0)
 592             return ret;
 593
 594         ret = avfilter_link(last_filter, pad_idx, format, 0);
 595         if (ret < 0)
 596             return ret;
 597
 598         last_filter = format;
 599         pad_idx = 0;
 600     }
 601
 602     if (audio_volume != 256 && 0) {
 603         char args[256];
 604
 605         snprintf(args, sizeof(args), "%f", audio_volume / 256.);
 606         AUTO_INSERT_FILTER("-vol", "volume", args);
 607     }
 608
 609     if (ost->apad && of->shortest) {
 610         char args[256];
 611         int i;
 612
 613         for (i=0; i<of->ctx->nb_streams; i++)
 614             if (of->ctx->streams[i]->codec->codec_type == AVMEDIA_TYPE_VIDEO)
 615                 break;
 616
 617         if (i<of->ctx->nb_streams) {
 618             snprintf(args, sizeof(args), "%s", ost->apad);
 619             AUTO_INSERT_FILTER("-apad", "apad", args);
 620         }
 621     }
 622
 623     snprintf(name, sizeof(name), "trim for output stream %d:%d",
 624              ost->file_index, ost->index);
 625     ret = insert_trim(of->start_time, of->recording_time,
 626                       &last_filter, &pad_idx, name);
 627     if (ret < 0)
 628         return ret;
 629
 630     if ((ret = avfilter_link(last_filter, pad_idx, ofilter->filter, 0)) < 0)
 631         return ret;
 632
 633     return 0;
 634 }
 635
 636 #define DESCRIBE_FILTER_LINK(f, inout, in)                         \
 637 {                                                                  \
 638     AVFilterContext *ctx = inout->filter_ctx;                      \
 639     AVFilterPad *pads = in ? ctx->input_pads  : ctx->output_pads;  \
 640     int       nb_pads = in ? ctx->nb_inputs   : ctx->nb_outputs;   \
 641     AVIOContext *pb;                                               \
 642                                                                    \
 643     if (avio_open_dyn_buf(&pb) < 0)                                \
 644         exit_program(1);                                           \
 645                                                                    \
 646     avio_printf(pb, "%s", ctx->filter->name);                      \
 647     if (nb_pads > 1)                                               \
 648         avio_printf(pb, ":%s", avfilter_pad_get_name(pads, inout->pad_idx));\
 649     avio_w8(pb, 0);                                                \
 650     avio_close_dyn_buf(pb, &f->name);                              \
 651 }
 652
 653 int configure_output_filter(FilterGraph *fg, OutputFilter *ofilter, AVFilterInOut *out)
 654 {
 655     av_freep(&ofilter->name);
 656     DESCRIBE_FILTER_LINK(ofilter, out, 0);
 657
 658     if (!ofilter->ost) {
 659         av_log(NULL, AV_LOG_FATAL, "Filter %s has an unconnected output\n", ofilter->name);
 660         exit_program(1);
 661     }
 662
 663     switch (avfilter_pad_get_type(out->filter_ctx->output_pads, out->pad_idx)) {
 664     case AVMEDIA_TYPE_VIDEO: return configure_output_video_filter(fg, ofilter, out);
 665     case AVMEDIA_TYPE_AUDIO: return configure_output_audio_filter(fg, ofilter, out);
 666     default: av_assert0(0);
 667     }
 668 }
 669
 670 static int sub2video_prepare(InputStream *ist)
 671 {
 672     AVFormatContext *avf = input_files[ist->file_index]->ctx;
 673     int i, w, h;
 674
 675     /* Compute the size of the canvas for the subtitles stream.
 676        If the subtitles codec has set a size, use it. Otherwise use the
 677        maximum dimensions of the video streams in the same file. */
 678     w = ist->dec_ctx->width;
 679     h = ist->dec_ctx->height;
 680     if (!(w && h)) {
 681         for (i = 0; i < avf->nb_streams; i++) {
 682             if (avf->streams[i]->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
 683                 w = FFMAX(w, avf->streams[i]->codec->width);
 684                 h = FFMAX(h, avf->streams[i]->codec->height);
 685             }
 686         }
 687         if (!(w && h)) {
 688             w = FFMAX(w, 720);
 689             h = FFMAX(h, 576);
 690         }
 691         av_log(avf, AV_LOG_INFO, "sub2video: using %dx%d canvas\n", w, h);
 692     }
 693     ist->sub2video.w = ist->resample_width  = w;
 694     ist->sub2video.h = ist->resample_height = h;
 695
 696     /* rectangles are AV_PIX_FMT_PAL8, but we have no guarantee that the
 697        palettes for all rectangles are identical or compatible */
 698     ist->resample_pix_fmt = ist->dec_ctx->pix_fmt = AV_PIX_FMT_RGB32;
 699
 700     ist->sub2video.frame = av_frame_alloc();
 701     if (!ist->sub2video.frame)
 702         return AVERROR(ENOMEM);
 703     ist->sub2video.last_pts = INT64_MIN;
 704     return 0;
 705 }
 706
 707 static int configure_input_video_filter(FilterGraph *fg, InputFilter *ifilter,
 708                                         AVFilterInOut *in)
 709 {
 710     AVFilterContext *last_filter;
 711     const AVFilter *buffer_filt = avfilter_get_by_name("buffer");
 712     InputStream *ist = ifilter->ist;
 713     InputFile     *f = input_files[ist->file_index];
 714     AVRational tb = ist->framerate.num ? av_inv_q(ist->framerate) :
 715                                          ist->st->time_base;
 716     AVRational fr = ist->framerate;
 717     AVRational sar;
 718     AVBPrint args;
 719     char name[255];
 720     int ret, pad_idx = 0;
 721     int64_t tsoffset = 0;
 722     AVBufferSrcParameters *par = av_buffersrc_parameters_alloc();
 723
 724     if (!par)
 725         return AVERROR(ENOMEM);
 726     memset(par, 0, sizeof(*par));
 727     par->format = AV_PIX_FMT_NONE;
 728
 729     if (ist->dec_ctx->codec_type == AVMEDIA_TYPE_AUDIO) {
 730         av_log(NULL, AV_LOG_ERROR, "Cannot connect video filter to audio input\n");
 731         ret = AVERROR(EINVAL);
 732         goto fail;
 733     }
 734
 735     if (!fr.num)
 736         fr = av_guess_frame_rate(input_files[ist->file_index]->ctx, ist->st, NULL);
 737
 738     if (ist->dec_ctx->codec_type == AVMEDIA_TYPE_SUBTITLE) {
 739         ret = sub2video_prepare(ist);
 740         if (ret < 0)
 741             goto fail;
 742     }
 743
 744     sar = ist->st->sample_aspect_ratio.num ?
 745           ist->st->sample_aspect_ratio :
 746           ist->dec_ctx->sample_aspect_ratio;
 747     if(!sar.den)
 748         sar = (AVRational){0,1};
 749     av_bprint_init(&args, 0, 1);
 750     av_bprintf(&args,
 751              "video_size=%dx%d:pix_fmt=%d:time_base=%d/%d:"
 752              "pixel_aspect=%d/%d:sws_param=flags=%d", ist->resample_width,
 753              ist->resample_height,
 754              ist->hwaccel_retrieve_data ? ist->hwaccel_retrieved_pix_fmt : ist->resample_pix_fmt,
 755              tb.num, tb.den, sar.num, sar.den,
 756              SWS_BILINEAR + ((ist->dec_ctx->flags&AV_CODEC_FLAG_BITEXACT) ? SWS_BITEXACT:0));
 757     if (fr.num && fr.den)
 758         av_bprintf(&args, ":frame_rate=%d/%d", fr.num, fr.den);
 759     snprintf(name, sizeof(name), "graph %d input from stream %d:%d", fg->index,
 760              ist->file_index, ist->st->index);
 761
 762
 763     if ((ret = avfilter_graph_create_filter(&ifilter->filter, buffer_filt, name,
 764                                             args.str, NULL, fg->graph)) < 0)
 765         goto fail;
 766     par->hw_frames_ctx = ist->hw_frames_ctx;
 767     ret = av_buffersrc_parameters_set(ifilter->filter, par);
 768     if (ret < 0)
 769         goto fail;
 770     av_freep(&par);
 771     last_filter = ifilter->filter;
 772
 773     if (ist->autorotate) {
 774         double theta = get_rotation(ist->st);
 775
 776         if (fabs(theta - 90) < 1.0) {
 777             ret = insert_filter(&last_filter, &pad_idx, "transpose", "clock");
 778         } else if (fabs(theta - 180) < 1.0) {
 779             ret = insert_filter(&last_filter, &pad_idx, "hflip", NULL);
 780             if (ret < 0)
 781                 return ret;
 782             ret = insert_filter(&last_filter, &pad_idx, "vflip", NULL);
 783         } else if (fabs(theta - 270) < 1.0) {
 784             ret = insert_filter(&last_filter, &pad_idx, "transpose", "cclock");
 785         } else if (fabs(theta) > 1.0) {
 786             char rotate_buf[64];
 787             snprintf(rotate_buf, sizeof(rotate_buf), "%f*PI/180", theta);
 788             ret = insert_filter(&last_filter, &pad_idx, "rotate", rotate_buf);
 789         }
 790         if (ret < 0)
 791             return ret;
 792     }
 793
 794     if (ist->framerate.num) {
 795         AVFilterContext *setpts;
 796
 797         snprintf(name, sizeof(name), "force CFR for input from stream %d:%d",
 798                  ist->file_index, ist->st->index);
 799         if ((ret = avfilter_graph_create_filter(&setpts,
 800                                                 avfilter_get_by_name("setpts"),
 801                                                 name, "N", NULL,
 802                                                 fg->graph)) < 0)
 803             return ret;
 804
 805         if ((ret = avfilter_link(last_filter, 0, setpts, 0)) < 0)
 806             return ret;
 807
 808         last_filter = setpts;
 809     }
 810
 811     if (do_deinterlace) {
 812         AVFilterContext *yadif;
 813
 814         snprintf(name, sizeof(name), "deinterlace input from stream %d:%d",
 815                  ist->file_index, ist->st->index);
 816         if ((ret = avfilter_graph_create_filter(&yadif,
 817                                                 avfilter_get_by_name("yadif"),
 818                                                 name, "", NULL,
 819                                                 fg->graph)) < 0)
 820             return ret;
 821
 822         if ((ret = avfilter_link(last_filter, 0, yadif, 0)) < 0)
 823             return ret;
 824
 825         last_filter = yadif;
 826     }
 827
 828     snprintf(name, sizeof(name), "trim for input stream %d:%d",
 829              ist->file_index, ist->st->index);
 830     if (copy_ts) {
 831         tsoffset = f->start_time == AV_NOPTS_VALUE ? 0 : f->start_time;
 832         if (!start_at_zero && f->ctx->start_time != AV_NOPTS_VALUE)
 833             tsoffset += f->ctx->start_time;
 834     }
 835     ret = insert_trim(((f->start_time == AV_NOPTS_VALUE) || !f->accurate_seek) ?
 836                       AV_NOPTS_VALUE : tsoffset, f->recording_time,
 837                       &last_filter, &pad_idx, name);
 838     if (ret < 0)
 839         return ret;
 840
 841     if ((ret = avfilter_link(last_filter, 0, in->filter_ctx, in->pad_idx)) < 0)
 842         return ret;
 843     return 0;
 844 fail:
 845     av_freep(&par);
 846
 847     return ret;
 848 }
 849
 850 static int configure_input_audio_filter(FilterGraph *fg, InputFilter *ifilter,
 851                                         AVFilterInOut *in)
 852 {
 853     AVFilterContext *last_filter;
 854     const AVFilter *abuffer_filt = avfilter_get_by_name("abuffer");
 855     InputStream *ist = ifilter->ist;
 856     InputFile     *f = input_files[ist->file_index];
 857     AVBPrint args;
 858     char name[255];
 859     int ret, pad_idx = 0;
 860     int64_t tsoffset = 0;
 861
 862     if (ist->dec_ctx->codec_type != AVMEDIA_TYPE_AUDIO) {
 863         av_log(NULL, AV_LOG_ERROR, "Cannot connect audio filter to non audio input\n");
 864         return AVERROR(EINVAL);
 865     }
 866
 867     av_bprint_init(&args, 0, AV_BPRINT_SIZE_AUTOMATIC);
 868     av_bprintf(&args, "time_base=%d/%d:sample_rate=%d:sample_fmt=%s",
 869              1, ist->dec_ctx->sample_rate,
 870              ist->dec_ctx->sample_rate,
 871              av_get_sample_fmt_name(ist->dec_ctx->sample_fmt));
 872     if (ist->dec_ctx->channel_layout)
 873         av_bprintf(&args, ":channel_layout=0x%"PRIx64,
 874                    ist->dec_ctx->channel_layout);
 875     else
 876         av_bprintf(&args, ":channels=%d", ist->dec_ctx->channels);
 877     snprintf(name, sizeof(name), "graph %d input from stream %d:%d", fg->index,
 878              ist->file_index, ist->st->index);
 879
 880     if ((ret = avfilter_graph_create_filter(&ifilter->filter, abuffer_filt,
 881                                             name, args.str, NULL,
 882                                             fg->graph)) < 0)
 883         return ret;
 884     last_filter = ifilter->filter;
 885
 886 #define AUTO_INSERT_FILTER_INPUT(opt_name, filter_name, arg) do {                 \
 887     AVFilterContext *filt_ctx;                                              \
 888                                                                             \
 889     av_log(NULL, AV_LOG_INFO, opt_name " is forwarded to lavfi "            \
 890            "similarly to -af " filter_name "=%s.\n", arg);                  \
 891                                                                             \
 892     snprintf(name, sizeof(name), "graph %d %s for input stream %d:%d",      \
 893                 fg->index, filter_name, ist->file_index, ist->st->index);   \
 894     ret = avfilter_graph_create_filter(&filt_ctx,                           \
 895                                        avfilter_get_by_name(filter_name),   \
 896                                        name, arg, NULL, fg->graph);         \
 897     if (ret < 0)                                                            \
 898         return ret;                                                         \
 899                                                                             \
 900     ret = avfilter_link(last_filter, 0, filt_ctx, 0);                       \
 901     if (ret < 0)                                                            \
 902         return ret;                                                         \
 903                                                                             \
 904     last_filter = filt_ctx;                                                 \
 905 } while (0)
 906
 907     if (audio_sync_method > 0) {
 908         char args[256] = {0};
 909
 910         av_strlcatf(args, sizeof(args), "async=%d", audio_sync_method);
 911         if (audio_drift_threshold != 0.1)
 912             av_strlcatf(args, sizeof(args), ":min_hard_comp=%f", audio_drift_threshold);
 913         if (!fg->reconfiguration)
 914             av_strlcatf(args, sizeof(args), ":first_pts=0");
 915         AUTO_INSERT_FILTER_INPUT("-async", "aresample", args);
 916     }
 917
 918 //     if (ost->audio_channels_mapped) {
 919 //         int i;
 920 //         AVBPrint pan_buf;
 921 //         av_bprint_init(&pan_buf, 256, 8192);
 922 //         av_bprintf(&pan_buf, "0x%"PRIx64,
 923 //                    av_get_default_channel_layout(ost->audio_channels_mapped));
 924 //         for (i = 0; i < ost->audio_channels_mapped; i++)
 925 //             if (ost->audio_channels_map[i] != -1)
 926 //                 av_bprintf(&pan_buf, ":c%d=c%d", i, ost->audio_channels_map[i]);
 927 //         AUTO_INSERT_FILTER_INPUT("-map_channel", "pan", pan_buf.str);
 928 //         av_bprint_finalize(&pan_buf, NULL);
 929 //     }
 930
 931     if (audio_volume != 256) {
 932         char args[256];
 933
 934         av_log(NULL, AV_LOG_WARNING, "-vol has been deprecated. Use the volume "
 935                "audio filter instead.\n");
 936
 937         snprintf(args, sizeof(args), "%f", audio_volume / 256.);
 938         AUTO_INSERT_FILTER_INPUT("-vol", "volume", args);
 939     }
 940
 941     snprintf(name, sizeof(name), "trim for input stream %d:%d",
 942              ist->file_index, ist->st->index);
 943     if (copy_ts) {
 944         tsoffset = f->start_time == AV_NOPTS_VALUE ? 0 : f->start_time;
 945         if (!start_at_zero && f->ctx->start_time != AV_NOPTS_VALUE)
 946             tsoffset += f->ctx->start_time;
 947     }
 948     ret = insert_trim(((f->start_time == AV_NOPTS_VALUE) || !f->accurate_seek) ?
 949                       AV_NOPTS_VALUE : tsoffset, f->recording_time,
 950                       &last_filter, &pad_idx, name);
 951     if (ret < 0)
 952         return ret;
 953
 954     if ((ret = avfilter_link(last_filter, 0, in->filter_ctx, in->pad_idx)) < 0)
 955         return ret;
 956
 957     return 0;
 958 }
 959
 960 static int configure_input_filter(FilterGraph *fg, InputFilter *ifilter,
 961                                   AVFilterInOut *in)
 962 {
 963     av_freep(&ifilter->name);
 964     DESCRIBE_FILTER_LINK(ifilter, in, 1);
 965
 966     if (!ifilter->ist->dec) {
 967         av_log(NULL, AV_LOG_ERROR,
 968                "No decoder for stream #%d:%d, filtering impossible\n",
 969                ifilter->ist->file_index, ifilter->ist->st->index);
 970         return AVERROR_DECODER_NOT_FOUND;
 971     }
 972     switch (avfilter_pad_get_type(in->filter_ctx->input_pads, in->pad_idx)) {
 973     case AVMEDIA_TYPE_VIDEO: return configure_input_video_filter(fg, ifilter, in);
 974     case AVMEDIA_TYPE_AUDIO: return configure_input_audio_filter(fg, ifilter, in);
 975     default: av_assert0(0);
 976     }
 977 }
 978
 979 int configure_filtergraph(FilterGraph *fg)
 980 {
 981     AVFilterInOut *inputs, *outputs, *cur;
 982     int ret, i, simple = filtergraph_is_simple(fg);
 983     const char *graph_desc = simple ? fg->outputs[0]->ost->avfilter :
 984                                       fg->graph_desc;
 985
 986     avfilter_graph_free(&fg->graph);
 987     if (!(fg->graph = avfilter_graph_alloc()))
 988         return AVERROR(ENOMEM);
 989
 990     if (simple) {
 991         OutputStream *ost = fg->outputs[0]->ost;
 992         char args[512];
 993         AVDictionaryEntry *e = NULL;
 994
 995         args[0] = 0;
 996         while ((e = av_dict_get(ost->sws_dict, "", e,
 997                                 AV_DICT_IGNORE_SUFFIX))) {
 998             av_strlcatf(args, sizeof(args), "%s=%s:", e->key, e->value);
 999         }
1000         if (strlen(args))
1001             args[strlen(args)-1] = 0;
1002         fg->graph->scale_sws_opts = av_strdup(args);
1003
1004         args[0] = 0;
1005         while ((e = av_dict_get(ost->swr_opts, "", e,
1006                                 AV_DICT_IGNORE_SUFFIX))) {
1007             av_strlcatf(args, sizeof(args), "%s=%s:", e->key, e->value);
1008         }
1009         if (strlen(args))
1010             args[strlen(args)-1] = 0;
1011         av_opt_set(fg->graph, "aresample_swr_opts", args, 0);
1012
1013         args[0] = '\0';
1014         while ((e = av_dict_get(fg->outputs[0]->ost->resample_opts, "", e,
1015                                 AV_DICT_IGNORE_SUFFIX))) {
1016             av_strlcatf(args, sizeof(args), "%s=%s:", e->key, e->value);
1017         }
1018         if (strlen(args))
1019             args[strlen(args) - 1] = '\0';
1020         fg->graph->resample_lavr_opts = av_strdup(args);
1021
1022         e = av_dict_get(ost->encoder_opts, "threads", NULL, 0);
1023         if (e)
1024             av_opt_set(fg->graph, "threads", e->value, 0);
1025     }
1026
1027     if ((ret = avfilter_graph_parse2(fg->graph, graph_desc, &inputs, &outputs)) < 0)
1028         return ret;
1029
1030     if (hw_device_ctx) {
1031         for (i = 0; i < fg->graph->nb_filters; i++) {
1032             fg->graph->filters[i]->hw_device_ctx = av_buffer_ref(hw_device_ctx);
1033         }
1034     }
1035
1036     if (simple && (!inputs || inputs->next || !outputs || outputs->next)) {
1037         const char *num_inputs;
1038         const char *num_outputs;
1039         if (!outputs) {
1040             num_outputs = "0";
1041         } else if (outputs->next) {
1042             num_outputs = ">1";
1043         } else {
1044             num_outputs = "1";
1045         }
1046         if (!inputs) {
1047             num_inputs = "0";
1048         } else if (inputs->next) {
1049             num_inputs = ">1";
1050         } else {
1051             num_inputs = "1";
1052         }
1053         av_log(NULL, AV_LOG_ERROR, "Simple filtergraph '%s' was expected "
1054                "to have exactly 1 input and 1 output."
1055                " However, it had %s input(s) and %s output(s)."
1056                " Please adjust, or use a complex filtergraph (-filter_complex) instead.\n",
1057                graph_desc, num_inputs, num_outputs);
1058         return AVERROR(EINVAL);
1059     }
1060
1061     for (cur = inputs, i = 0; cur; cur = cur->next, i++)
1062         if ((ret = configure_input_filter(fg, fg->inputs[i], cur)) < 0) {
1063             avfilter_inout_free(&inputs);
1064             avfilter_inout_free(&outputs);
1065             return ret;
1066         }
1067     avfilter_inout_free(&inputs);
1068
1069     for (cur = outputs, i = 0; cur; cur = cur->next, i++)
1070         configure_output_filter(fg, fg->outputs[i], cur);
1071     avfilter_inout_free(&outputs);
1072
1073     if ((ret = avfilter_graph_config(fg->graph, NULL)) < 0)
1074         return ret;
1075
1076     fg->reconfiguration = 1;
1077
1078     for (i = 0; i < fg->nb_outputs; i++) {
1079         OutputStream *ost = fg->outputs[i]->ost;
1080         if (!ost->enc) {
1081             /* identical to the same check in ffmpeg.c, needed because
1082                complex filter graphs are initialized earlier */
1083             av_log(NULL, AV_LOG_ERROR, "Encoder (codec %s) not found for output stream #%d:%d\n",
1084                      avcodec_get_name(ost->st->codec->codec_id), ost->file_index, ost->index);
1085             return AVERROR(EINVAL);
1086         }
1087         if (ost->enc->type == AVMEDIA_TYPE_AUDIO &&
1088             !(ost->enc->capabilities & AV_CODEC_CAP_VARIABLE_FRAME_SIZE))
1089             av_buffersink_set_frame_size(ost->filter->filter,
1090                                          ost->enc_ctx->frame_size);
1091     }
1092
1093     return 0;
1094 }
1095
1096 int ist_in_filtergraph(FilterGraph *fg, InputStream *ist)
1097 {
1098     int i;
1099     for (i = 0; i < fg->nb_inputs; i++)
1100         if (fg->inputs[i]->ist == ist)
1101             return 1;
1102     return 0;
1103 }
1104
1105 int filtergraph_is_simple(FilterGraph *fg)
1106 {
1107     return !fg->graph_desc;
1108 }